西红柿对聚烯烃控释肥这种新的施肥方法的反应

The response of tomato （Lycopersicon esculentum） plants basically fertilized with 0.3 g N per plant of compound fertilizer with a N：P2O5：K2O ratio of 20：10：20 to sticks of polyolefin-coated fertilizer （POCF） （LongT0 with a N：P2Os：K2O ratio of 14：12：14） applied 23 d after transplanting was investigated using rooting boxes in the greenhouse. The results at 26 and 40 d after stick fertilizer treatment showed that the use of the stick fertilizer greatly increased the production of many new fine roots from the tomato plants. Compared to the unfertilized control, root length and root length density in the stick fertilizer treatment increased by 3.6-6.7 fold. In the soil zones near the stick fertilizer, root weight and root mass density were also significantly higher for the stick fertilizer treatment. Additionally, the use of the stick fertilizer increased the N, P and K concentrations in the leaves and stems of the tomato plants. The new fine roots growing near the stick fertilizer not only absorbed more nutrients and translocated them to the shoots, but also contained more nutrients within themselves. The soil ammonium and nitrate N data showed that N released from the stick fertilizer played a major role in inducing the production of new fine roots. These results indicated that stick fertilizer could be used as an alternative to the co-situs application technique to change and control the root distribution of crops as well as to increase the potential capacity of roots for water and nutrient absorption.     

基于农业科研资源的特色科普体系构建——以广西壮族自治区亚热带作物研究所为例

“科技创新、科学普及是实现创新发展的两翼,要把科学普及放在与科技创新同等重要的位置”,科普工作或将成为科研单位的重要功能之一。为探索农业科研机构在科研工作的基础上协同开展科普工作的高效模式,提高创新力,以广西壮族自治区亚热带作物研究所为例,分析其如何结合情势发展需求,充分挖掘并优化现有的科技人才、科研设施、科技成果等资源应用于科普工作中,突出优势,办出特色的科普工作经验。提出了科研机构在分析、整合资源的基础上,找准定位、突出特色,构建担负提高公众科学素养的责任以外,兼具以培养科研队伍及促进科研成果的转化和开发为重要目的的科普体系,为科研单位高质量开展特色科普工作提供借鉴。     

“三高”农业与土肥作用及对策—以梅县为例

“三高”农业与土壤和肥料有密切关系。地力是作物产量和质量的重要基础，要取得高产、优质、高效，就必须坚持不懈地培肥地力。土壤中营养元素的含量、肥料类型和施肥技术，都对农产品产量和品质有很大的影响。因此，培肥地力因土种植、合理施肥能提高经济效益、生态效益和社会效益。忽视土肥工作，将影响“三高”农业的发展。     

为21世纪土壤科学的创新发展作出新的贡献——参加第17届国际土壤学大会综述

今年8月14～21日，在泰国曼谷召开了第17届国际土壤学大会，这是在21世纪首次举行的全球性的土壤科学学术盛会。在14日的开幕式上，泰国皇家王室M C Sirindhorn公主亲莅会场致开幕词，并为大会展览厅揭幕。曼谷市市长、泰国土地发展部部长、本届国际土壤学会主席及秘书长等人在